Agreed, I typed quickly before bed and meant MST not alt mode.
But otherwise you’re just arguing that it’s not a big deal because ‘you don’t need any of these fancy features if you throw out your monitor every three years and buy new thousand dollar ones’.
For everyone who doesn’t want to contribute to massive piles of e-waste, we still have 1080p and 1440p, 60Hz monitors kicking around, and there is no excuse for a Mac to only be able to drive one of them with crappy looking text. It could easily drive 6 within the bandwidth of a 4k, 120Hz signal. Hell it could drive 8 or more if you drop the refresh down to 30.